Lifting-jack



(mm-(181.) V f D G. J. BALDWIN.

Lifting Jack.

No. 235,404. Patented Dec. 14,- I88 0 ,V Vi'zhass zkz l' I jzvenfaf j Iw y/QM UNITED STATES PATENT ()FFICE.

CHARLES J. BALDWIN, OF OOLMAR, PENNSYLVANIA.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 235,404, dated December14, 1880.

Application filed August 20, 1880.

To all whom it may concern:

Be it known that I, CHARLES J. BALDWIN, of Golmar, in the county ofMontgomery and State of Pennsylvania, have invented certain new anduseful Improvements in Lifting- Jacks; and I do hereby declare thefollowing to he a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use it, reference being had to the accompanying drawings, whichform part of this specification.

My invention relates to an improvement in lifting-jacks; and it consistsin the combination of an operating-lever having secured to or formedupon the edge of its inner end two y or more projections for catchingunder the axle,

and two or more staples through which the pivotal bolt catches, with thetwo perforated uprights in which the lever can be vertically adjusted,substantially as described.

The object of my invention is to provide a lifting-jack in which thelever is provided with two or more fulcrums, so as not only to gain anincreased leverage for a heavy vehicle, but so that the distance whichthe vehicle is to be lifted upward can be regulated at will.

Figure 1 is a side elevation of my invention complete. Fig. 2 is aperspective of the'operating-lever alone.

A represents a suitable wooden standard of any desired form, shape, orconstruction, and which has secured to its upper end the two perforatedsupports B. In between these two supports B the operating-lever O ispivoted, and this lever, by means of the perforationsin the supports,can be adjusted vertically, so as tobe adapted to vehicles of differentheights.

Secured t0 the inner edge of the operatinglever 0 is an iron baud, D,upon which are formed the two projections I, for catching under the axleof the vehicle that is to be operated upon. Also secured to orprojecting be- (No model.)

There being two projections upon the end of the lever to catch under theaxle, and two stapics or bearings, so that the fulcrum of the lever canbe changed from one place to the other, it will readily be seen that agreater or less leverage can be obtained, according to the weight of thevehicle that is to be raised, and that the vehicle can be raised agreater orless height, as may be desired.

One of the great objections to most of the jacks now in use is that thelever has only a single fulcrum, and hence there is only the same amountof leverage for both heavy and light vehicles, and this defect myinvention entirely overcomes.

After one of the points or projections on the lever has been caughtunder the axle it is only necessary to bear down upon the outer end ofthe lever until the lever has passed the center of its fulcrum, andthe'vehicle will then remain in a raised condition without the necessityof holding the lever down. While the inner end of the lever is depressedso as to bear against the edge of the standard A, it is held in positionby means of the spring-catch P, which, by catching over the lower end ofthe lever, holds it in a nearly-vertical position without any otherhelp.

Having thus described my invention, I claim The combination of thestandard A, perforated supports B, and lever G, having the metallic bandD secured upon its end, the band being provided with the projections L,and staples O, with the pivotal bolt upon which the lever turns, and acatch,1, to hold the lever while there is a weight upon it,substantially as shown.

In testimony that I claim the foregoing I have hereunto set my hand this12th day'of August, 1880.

CHAS. JACOB BALDWIN.

Witnesses N. B. BALDWIN, J. J. BoTzELL.

